Are the side rails needed.

I'm planning to build a teardrop trailer, which uses a 5x10 deck. I need an open deck trailer like the one in the related product. Can I remove the side rails without affecting the overall strength of the trailer.

This blueprint to build a trailer is the basis to build a trailer. The side rails would be part of the structure and strength of the trailer. You could build the trailer with a heavier gauge metal for the deck and not use the side rails.